36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Size –

+ Product Details Size – 10" x 32" or 32" x 10" is the size for the duct opening measurement only

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75"H – fits a 16" X 4" duct opening

our Circular Air Supply Valves are ideal for low and medium pressure ventilation air conditioning systems

36" x 26" Cube Core Eggcrate Return Air Filter Grille for 1" Filter 14" Diameter + Product Details Size –+ Product Details Perfect Fit & Easy Sizing Designed for a 36" x 26" OR 26" x 36" duct opening (measured at the opening), with actual outer dimensions of 38. 5" W x 28. 5" H. Please check the measuring guide to ensure a proper fit. Filter Size 35. 75" x 25. 75" x 1" Premium Airflow Efficiency High performance cube core eggcrate design allows 95% airflow efficiency, reducing energy costs and maximizing HVAC system lifespan. Durable, Rust Free Aluminum